No content when using subcollections

Maybe somebody can help me with the following problem. I've a problem when
using subcollections in GSDL 2.37 (Linux). When I make use of subcollections
no content is shown in the browser when I open a document. Only the Title
appears, this both in Opera 5 and Netscape 4.77.

All the documents are available in the different subcollections and are
processed by the plugins. If have taken a look at the .xml files in the
archive directory and they look fine to me.